carb sync

[movenon]

If you are 5 turns out on the fuel/air screws then I would suggest your pilot jets are either to lean or dirty. You should be closer to 2 to 3 turns out.  Not a fan of DynoJet but they will work.  The fuel/air screws and pilot jets effect your throttle opening mostly from 0 to 1/4 throttle.
George

[Mark Olson]

If you are 5 turns out on the fuel/air screws then I would suggest your pilot jets are either to lean or dirty. You should be closer to 2 to 3 turns out.  Not a fan of DynoJet but they will work.  The fuel/air screws and pilot jets effect your throttle opening mostly from 0 to 1/4 throttle.
George

Yeah , what George Said... 5 turns way too much. you need new pilot jets. (bigger)

[Cash Dereszynski]

Could it be float bowl height?

Cash

[movenon]

Shooting in the dark here.  Your floats should be set at 22mm.  http://www.fjowners.com/index.php?topic=9560.0  scroll down to the fifth post. Your pilot jets need to CLEAN.  And probably larger if you are 5 turns out.  Most of the FJ's that upgrade go to 40 or 42.5 Mikuni pilots.  Be aware that "DynoJet" jet numbers are not the same as Mikuni's. That's one of the reasons I don't like DynoJet conversions. I know , I had one...
George

[FJmonkey]

Once we got the carbs synced it idled well. There was an occasional pop coming from carb #1, I could see it on the manometer when it happened. I did not ride it so I can't help on throttle response at different positions.

[Cash Dereszynski]

Picture of plug before raising needle.

Cash

[Cash Dereszynski]

Seafoam worked for me . Now the FJ feels like it should
A beast.

Cash

[Cash Dereszynski]

It's still lean. 20 miles in town . With seafoam additive.

Cash

[Cash Dereszynski]

On the advice of dynajet I've moved the needles up two notches. At times it runs at all throttle settings smoothly . Alternitely hesitating and popping other times .Also it's very cold blooded and warm up is two cigarettes . The symptom of surging and popping seems like fuel starvation so I'm suspecting the vacuum petcock maybe another possible source of the problems. I'm riding it but not too far from the home base. Got to Malibu turned back after it seems to be running out of gas, but by the time I got home it was strong again at all settings . WTF ? More riding to test what is really happening.

Pix is a gutter in Malibu FJ idleing for 10 minutes.

Cheers,

Cash

[FJmonkey]

Cash, do the suck test on the vacuum line. leave it on the petcock, when you draw vacuum it should give a little then you should feel like the tube is plugged. If you can keep sucking air, then the hose or petcock is failing/failed. I had intermittent fuel feed issues on my '86 till I discovered the petcock was on its last legs.

[Pat Conlon]

I hope you were kidding about your FJ idling for 10 minutes.

You think you have problems now....wait until you cook those exhaust valves.

Stop what you are doing. Take your carbs off. Drain the gas. Box them up and send them to RPM.

[Cash Dereszynski]

I hope you were kidding about your FJ idling for 10 minutes.

You think you have problems now....wait until you cook those exhaust valves.

Stop what you are doing. Take your carbs off. Drain the gas. Box them up and send them to RPM.

That may be the next step. I've been Talking to RPM,I'd take them off,box um, and Ride there on my Beemer.

Cash

[Cash Dereszynski]

Cash, do the suck test on the vacuum line. leave it on the petcock, when you draw vacuum it should give a little then you should feel like the tube is plugged. If you can keep sucking air, then the hose or petcock is failing/failed. I had intermittent fuel feed issues on my '86 till I discovered the petcock was on its last legs.

I'll try that.

Thnx

Cash

[Mark Olson]

how is the gas cap vent? I see a magnetic tank bag in the pic ... they are known to cause a vacuum lock and starve carbs.

[Cash Dereszynski]

how is the gas cap vent? I see a magnetic tank bag in the pic ... they are known to cause a vacuum lock and starve carbs.

I never heard that one before.

Cash